Screen or separator.



J. O. CLARK.

SCREEN 0B. SEPARATOR.

'APPLIOATION FILED APR.19, 1912.

1,049,052. Patented Dec. 31, 1912.

Z SHEETS-SHEET l.

i i/human: v 43 j /d w J. G. CLARK.

SURE-EN 'OR SEPARATOR.

APPLICATION FILED APR. 19, 1912. I 1,049,052, Patented Dec. 31, 1912.

2 SHEETS-SHEET 2.

lmmmo M MW UNITED STATES PATENT nron JOI-INC. CLARK, OF ATLANTA,GEORGIA;

seminar on snraimron.

particularly to devices for screening pulrerized materials.

. The objects of the inventionare to provide a screen or separator whichis simple in construction, durable and efficient in operation.

The invention relates specifically to that class of screens which arearranged on an incline and vibrated by means of suitable intermittentlyacting hammer mechanisms and the features of novelty will be apparentfrom the following description taken in connection with the accompanyingdrawings, in which Figure 1 is a front view of a screen embodying myinvention, certain parts being broken away to illustrate other parts;Fig.

2 a longitudinal section on the line 2-2 of Fig. 1; Fig. 3 is anenlarged side elevation of one of the striking or hammer mechanisms;and. Fig. 4 is afragmentary transrerse section on the line et4 of Fig.2.

p In the drawings, lO'and 11 indicate upright members which have theirlower ends connected with the base members 12 and 13 The base members 12and 13 are connected together near the uprights 10 and 11 by means of across-piece 14:. The

uprights 10' and 11. carry at their upper end one end" of the inclinedmembers 15, the lower end of these members being" connected with thebase members 12 and 13. Cleats 17 are secured along the lower edges ofthe members 15 and have secured thereto the bottom boards 18 and theremovable bottom section 19. The boards 18 andthe removable section 19are preferably covered on their upper side with sheet metal so as toform a durable wearing surface which will also permit the" material toslide freely therealong. Cleats 20 are also secured on the inner sidesof the members 15 and cooperate with the cross beams 21' and to supportthe screen 23. The screen 23'is secured at its upper end along theunderside of a cross memben24 which is preferably se- Specification ofLetters Patent. Patented Dec. 31,1912. Application filed April 19, 1912;Serial Nb.-e91,92e.-

secured to a cross-piece 26 and is preferably provided with longitudinalextending rein forcing strips 27 and 28. Secured to the members 15 abovethe cleats 20 are the members 29, along the top edge of which is securedthe screen 30 which is preferably ithe screens. The screen 23 has itslower end constructed with reinforcing strips 31 and 32 in'thesamemanner as the screen 23.

The removable topplates 34; are supported on the'upper edges of themembers 15. The lower'end of the casing inclosing the screens may beclosed by a suitable cross-piece 35. Ihe'upper end of the screen 30 issecured to the top of the member 24 and the lower end.

of'said screen is secured to a cross member '36, Which is preferablysecured to the members 29. n

At the top of the inclined frame'for they screens is a conveyer for 'thematerial to be screened; This conveyer may be of any desiredconstruction but I prefer to use and have illustrated a conveyer Whichconsists of a box or casing 37 having an inlet 37, and in which is ashaft 38. The shaft 3% carries a screw conveyer of the usual'constructionf At-the lower front-corner of the casing 37- is an opening39 through which:

the-material may be discharged from the casing 37 on to the screen 30.The opening 39 may be controlled by a sliding gate 40 'which may beconveniently operated by"- screw 41 having suitable. handwvheels 4L2.Extending transversely of the screen casmg below the screen 23 areshafts 43. l

have shown three such shafts but it will be understood thatI may use anynumber as may be fou-nddesirable. -These shaftsare supported in bearings44:, secured to the members 15 and on. the exterior thereof.

The shafts 43 have on one end thereof driving pulleys 45 which areengaged by a belt {16, the latter being driven by means of pulley 16mounted on'one end of the con veyer shaft 38, the opposite end of thisshaft being provided with a drive pulley 3S. Idler pulleys M may bearranged adjacent the pulleys 45 to increase'the area of contact of thebelt'46 on the pulleys 45. The' shafts 43 carry plates-{l8 havinglateral extensions 49 which are adapted to receive set screws or pins50. The set screws 50 engage threaded openings in the extensions 49 andare provided with lock nuts whereby the screws may be adjusted andsecurely held cured to the back-25 of the casing inclosing l n position.

On the under side of the screen 23 above the plates -48 are the plates53. These plates are preferably secured to the reinforcing strips 27 and2S and on the top of the strip 27 I arrange a plate and secure thisplate and the plate 53 in position by means of suitable bolts 55. Theplates .33 are provided with inclined surfaces 56 which are adapted tobe struck by the outer ends of the screws 50, as the shafts +13 rotate.This arrangement is clearly illustrated in Fig. 3.

The reinforcing strips 31 and 32 for the screen are preferably arrangeddirectly above the strips 27 and 28 for the screen 23 and on the underside of the strips 32 l secure the members 57 by means of suitable boltsSet screws 59 have screw-threaded engagement with the members 57 andproject above the reinforcing strip 31 and are provided above the latterwith looking nuts 60 which are adapted to hold the set screws inposition. The lower ends of the screws 59 normally bear on the uppersurface of the plates so that when the members 53 are struck by thescrews 50 the force of the blow will be conveyed to the screen 30. i

The operation of the mechanism is as follows The material to be screenedis fed into the inlet 37 of the conveyer casing 37 and is conveyedthrough the casing 37 by means of the screw conveyer above described.The

gate 40 being open to any suitable extent permits the material to fallfrom the casing 37on to the screen 30. The screen 30 is preferably muchcoarser than the screen 23 so that as the material moves downward on thescreen 30 the smaller particles Will fall through the meshes of thescreen on to the screen28. The rotation of the shafts 43 causes the setscrews 50 to strike the inclined surfaces 56 on the members 58 andsuddenly lift the screens with the material thereon. The suddenness ofthe blow struck by the screws 50 causes the finer particles of thematerial to pass through the screens and also causes the coarserparticles to be projected away from the screens and then fall back on tothe same. \When these particles again strike the screens they cause thefiner particles to fall through the meshes. Each time one of the screws50 strikes an inclined surface 56, some of the fine material will fallthrough the screen and the blow of the coarser iarticles on the screen,due to their falling onto the screen after being projected. away fromthe latter, causes an additional quantity of the fine material to fallthrough the screen and therefore it will be seen that v the machine willhave a very large screening capacity. The force of the blow struck bythe screws 50 being conveyed to the screen 30 by means of the set screws59, it will be seen that the screens 23 and 30 will be caused to vibratein unison. The lines of the material screened will pass through both ofthe blows may also be varied by changing screens and slide down theinclined bottom.

of the casing. The medium-sired particles will slide down along thescreen 23 and off the bottom thereof, while the coarsest particles-willslide down the screen 30 and off the bottom end of this screen. At thebottom of the casing suitable chutes or convey- ,ers may be provided tocarry away the sepa- By providing the adjustable set screws 50 and 59 Iam able to closely regulate the action of the screen 30 and also vibrateboth screens from a common vibrated mechanism. The amplitude of thevibrations may be varied by adjusting the screws 50 and the rapidity ofthe blows may be varied by increasing or decreasing the number of screwscarried by the plates 48 or by changing the speed of the shafts. 43. Theforce of tjie t e speed of. the shafts 43 and adjusting the screws 50.

It will be understood by those skilled in the art that various changesmay be made in the minor details of my invention within tween saidsupports, a shaft arranged transversely of the machine below the screen,and continuously rotating means rigidly mount ed on said shaft adaptedto intermittently strike said plate. 2. in a machine of the classdescribed, the combination of an inclined screen, means for rigidlysupporting said screen intermediate its ends, a shaft arranged below thescreen. a striking plate on the under side of said Screen, andadjustable means ii'igidly mount-- ed on said shaft adapted to strikesaio strilc ing plate. I

3. In a. machine of thee ass described. the combination of an inclinedscreen. a plurality of cross members adapted to rigidly support saidscreen intermediate its ends. a plate arranged on the under side of saidscreen and having a striking surface inclined relative to the latter. ashaft below said screen, a member rigidly mounted on said shaft. and aplurality of adjustable screws carried by said member and having one endthereof adapted to strike said inclined surface when said shaft isrotated.

In a machine of the class described, the combination of a plurality ofinclined screens arranged one above theother, a shaft arranged below thelower of said screens, a striking plate on the under side of the lowerscreen, a rigid spacing member secured to the upper screen and adaptedtoengage the upper'side of the lower screen directly above said strikingplate, and means on said shaft adapted to intermittently'strike saidstriking plate when said shaft is rotated.

5. In a machine of the class described, the combination of. a pluralityof inclined screens arranged one above the other, means adapted torigidly support the lower of said screens, a striking plate on the underside of the lower screen, an adjustable spacer secured to the upperscreen and adapted to engage the upper surface of the lower screendirectly above said striking plate, and means on said shaft adapted tostrike said striking plate when said shaft is rotated.

6. In a machine of the class described, the combination of a pluralityof inclined screens arranged one above the other, a plurality of crossmembers adapted to rigidly support the lower screen intermediate itsends, a striking plate secured to the under side of the lower screenbetween said cross pieces, spacer secured to the upper screen andadapted to contact with the upper surface of the lower screen directlyabove said striking plate,and means carried by said shaft adapted tostrike said striking plate when said shaft is rotated.

T. In a machine of the class described, the combination of a pluralityof inclined screens arranged one above the other, a shaft arranged belowthe lower screen, a striking plate secured to the under side of thelower screen, an adjustable spacer secured to the upper screen andarranged to contact with the upper side of the lower screen directlyabove said striking plate. and a pluralityof adjustable members rigidlymounted on said shaft and adapted to strike said striking plate whensaid shaft is rotated.

8. In a machine of the class described,the combination of a plurality ofinclined screens arranged one above the other, a plurality of shaftsarranged below the lower screen, a plurality of striking plates securedto the under side of the lower screen, a plurality of spacers secured tothe upper screen and arranged to engage the upper surface of the lowerscreen directly above said striking plates, and means carried by saidshafts adapted to strike said striking plates.

9. In a machine of the class described, the combination of a plurality.of inclined screens arranged one above the other, a plurality ofmembers adapted to rigidly support the lower screen intermediate itsends, a plurality of. shafts arranged below the lower screen, aplurality of striking plates secured -to theunder side of the lowerscreen, a plurality of adjustable spacers secured to the upper screenand arranged to contact with the upper surface of-the lower, screen directly above said' striking plates, and means carried by saidshaft'adapted to strike said striking plates to vibrate both of said screens.

10. In amachine of the class described, the combination of, a pluralityof inclined screens arranged one above the other, a plurality of shaftsarranged below the lower screen, a plurality of members arranged be-.tween said shafts and adapted to rigidly support the lower screen,striking plates secured to the under side of the lower screen. aplurality'of spacers secured to the upper screen and adapted to contactwith the upper surface of the lower screen directly above fsaidstrikingplates, and means carried by said shafts and arranged to strike saidstriking plates when said shafts are rotated.

11. "In a machine of the class described, the combination of a pluralityof inclined screens arranged one above the other, a plurality of shaftsarranged below the lower screen, a plurality of striking plates securedto the under side of the lower screen, adjustable spacing screws securedto the upper screen and having their lower ends arranged to contact withthe upper side of the lower screen directly above said striking plate,and a plurality of adjustable members carried by each of said shaftsarranged to strike said striking plates when said shafts are rotated.

In testimony whereof I affix my signature in presence of two'witnesses.

JOHN C. CLARK.

